Switching arrangement and transmission

Abstract

A connecting arrangement includes first and second idler gears (6, 7) arranged coaxially and connectable via an engagement unit. The engagement unit includes a coupling element coupled to the first idler gear (7) in a direction of rotation and axially movable between a home position and a coupling position. In the coupling position, the coupling element is coupled to the second idler gear (6) in addition to being coupled to the first idler gear (7) in the direction of rotation. In the home position, the coupling element and the second idler gear (6) are freely turnable with respect to each other. The first and second idler gears (6, 7) are helical-cut spur gears. The coupling element is guided in a helically extending guide (18) on the first idler gear (7) and, in the coupling position, engages into a helically extending engagement geometry (21) on the second idler gear (6).

The invention claimed is: 
     
       1. A connecting arrangement ( 15 ;  25 ), comprising:
 a first idler gear ( 7 ); 
 a second idler gear ( 6 ) arranged coaxially with the first idler gear ( 7 ); 
 an engagement unit, the first and second idler gears ( 6 ,  7 ) connectable to each other in a rotationally fixed manner via the engagement unit, the engagement unit comprising a coupling element ( 16 ;  27 ) which is coupled to the first idler gear ( 7 ) in a direction of rotation and is axially movable with respect to the first idler gear ( 7 ) between a home position and a coupling position, 
 wherein, in the coupling position of the coupling element ( 16 ;  27 ), the coupling element ( 16 ;  27 ) is coupled to the second idler gear ( 6 ) in addition to being coupled to the first idler gear ( 7 ) in the direction of rotation, 
 wherein, in the home position of the coupling element ( 16 ;  27 ), the coupling element ( 16 ;  27 ) is freely rotatable with respect to the second idler gear ( 6 ), 
 wherein the first and second idler gears ( 6 ,  7 ) are helical-cut spur gears, the coupling element ( 16 ;  27 ) is guided in a helically extending guide ( 18 ) formed on the first idler gear ( 7 ) and the coupling element ( 16 ;  27 ) engages into a helically extending engagement geometry ( 21 ) formed on the second idler gear ( 6 ) in the coupling position of the coupling element ( 16 ;  27 ), and 
 wherein the first idler gear ( 7 ) is axially spaced from the second idler gear ( 6 ), and axial forces generated during operation of the helical-cut spur gears are transmittable between the first and second idler gears ( 6 ,  7 ) via the coupling element ( 16 ;  27 ) in the coupling position of the coupling element ( 16 ;  27 ). 
 
     
     
       2. The connecting arrangement ( 15 ;  25 ) of  claim 1 , wherein pitches of running teeth ( 10 ,  11 ) of the first and second idler gears ( 6 ,  7 ), of the helically extending guide ( 18 ), and of the helically extending engagement geometry ( 21 ) correspond to one another. 
     
     
       3. The connecting arrangement ( 15 ;  25 ) of  claim 2 , wherein the pitches of the running teeth ( 10 ,  11 ) of the first and second idler gears ( 6 ,  7 ), of the helically extending guide ( 18 ), and of the helically extending engagement geometry ( 21 ) have a common pitch direction. 
     
     
       4. The connecting arrangement ( 15 ;  25 ) of  claim 1 , wherein one or both of the helically extending guide ( 18 ) and the helically extending engagement geometry ( 21 ) is a helical gearing ( 19 ,  22 ). 
     
     
       5. The connecting arrangement ( 15 ;  25 ) of  claim 1 , wherein the coupling element ( 16 ;  27 ) is a synchronizer sleeve ( 17 ;  26 ), and the synchronizer sleeve ( 17 ;  26 ) is coupled in a rotationally fixed manner to both to the first and second idler gears ( 6 ,  7 ) in the coupling position of the coupling element ( 16 ;  27 ). 
     
     
       6. The connecting arrangement ( 15 ;  25 ) of  claim 5 , wherein:
 the synchronizer sleeve ( 17 ;  26 ) comprises at least one helical gearing ( 20 ;  29 ,  30 ); and 
 the synchronizer sleeve ( 17 ;  26 ) is guided in the helically extending guide ( 18 ) via the at least one helical gearing ( 20 ;  29 ,  30 ) and/or the synchronizer sleeve ( 17 ;  26 ) engages into the helically extending engagement geometry ( 21 ) in the coupling position of the coupling element ( 16 ;  27 ). 
 
     
     
       7. The connecting arrangement ( 15 ;  25 ) of  claim 1 , wherein the engagement unit is a dog clutch. 
     
     
       8. The connecting arrangement of  claim 1 , wherein the engagement unit is a lock-synchronizer mechanism. 
     
     
       9. The connecting arrangement ( 25 ) of  claim 1 , wherein the first and second idler gears ( 6 ,  7 ) are rotatably mounted on a shaft ( 14 ), and the coupling element ( 27 ) is also axially movable into a further coupling position in which the coupling element ( 27 ) is rotationally fixed to the shaft ( 14 ). 
     
     
       10. A motor vehicle transmission ( 1 ), comprising the connecting arrangement ( 15 ;  25 ) of  claim 1 . 
     
     
       11. The connecting arrangement ( 25 ) of  claim 1 , wherein both of the first and second idler gears ( 6 ,  7 ) are supported by a common axial bearing in the coupling position of the coupling element ( 16 ;  27 ). 
     
     
       12. The connecting arrangement ( 25 ) of  claim 1 , wherein the common axial bearing is a sliding bearing.